The PCB has arrived.
Attached two pictures which show the 'third layer' - the CuBar connection between series diodes and MosFet drains.
The double pin rows are intended to comfort the leads of the TO247 with low inductance and at keep the design serviceable.

On a DIY point of view, what about output inductor ?
Are you recommending something specific, at least for the core, or can it be freely interpreted (doubt so). I find often coils the less DIYable stuff around.

@Reactance:
I am afraid - I have to assemble and debug it first.
But then I will post some screen shots as well.

@Effebi:
My first choice is a T157-2.
But I have given enough space in the PCB to comfort a large gapped ferrite E-core.
Most ferrite E-cores which offer an Ae around 200mm˛ should allow a useable solution.
In case you seriously consider to built the amp and have a specific core on hands we can go through the design procedure.
Please note, if you use a gapped E-core you should use HF-litz or at least DIY-multistranded, not a solid wire.

Today I had a meeting with guys from PowerInt (actually guys from Munich!). There is an upcoming 200V "Q-speed" diode series: 20, 30, 40 Amps. Unfortunately I can't find the specific 200V parts at their website.

..and to keep the readers happy until my proto goes on... -some pictures of my preferred output choke.
T157-2 with 33turns (most likely I will reduce it to 32 turns).
Solid wire of 1.32mm diameter.
I am offering to support other custom choke designs with gapped ferrites and multistranded twisted wires on request.